Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
  • C07D263/52—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems
  • C07D263/54—Benzoxazoles; Hydrogenated benzoxazoles
  • C07D263/58—Benzoxazoles; Hydrogenated benzoxazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
  • A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
  • A01N43/74—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,3
  • A01N43/76—1,3-Oxazoles; Hydrogenated 1,3-oxazoles

Definitions

• the present invention relates to optically active herbicidal (R)- phenoxypropionic acid N-methyl-N-2-fluorophenyl amide compounds represented in the following formula (1), a method for preparing thereof, their use to prevent generation of barnyard grass produced from rice and composition as suitable herbicides,
• X is hydrogen, halogen, hydroxy, NH 2 , C0 2 H, C ⁇ -C 6 alkylamino substituted with 1 or 2 of C1-C3 alkyl, ⁇ - _ alkyl, C ⁇ -C 6 alkoxy, CL-C 3 haloalkyl, C -C3 haloalkoxy, C 2 -C alkoxyalkoxy, Q-Ci alkylthonyl, C ⁇ -C 4 alkylsulfonyl, C 2 -C 6 alkenyl, C 2 -C 6 alkinyl, C 2 -C 6 alkenyloxy, C 2 -C 6 alkinyloxy, C ⁇ -C 3 alkoxycarbonyl, or Q-C3 alkylcarbonyl; Y is hydrogen or fluoro; and n is an integer of 0 to 2, wherein X can be a combination of other substituents when n is 2. [Background Art]
• (R ⁇ ) m is hydrogen, halogen, CF 3 , N0 2 , CN or alkyl; A is O, S or NH; R 2
• R3 and R may be identical or different and represent hydrogen, C ⁇ -C 6 alkyl, Ci-C ⁇ hydroxyalkyl, C3-C6 cycloalkyl, C1-C4 alkoxy, or phenyl substituted with 1 to 3 substituents chosen from C ⁇ -C alkyl, Ci-C 6 alkoxy, halogen and CF 3 .
• R5 is , where R 6 is hydrogen or halogen; R7 is hydrogen or alkyl ; and Z is , where R3 and R may be identical or different and represent hydrogen, Ct-Ce alkyl, Ci-C ⁇ hydroxyalkyl, C3-C6 cycloalkyl, O-Q alkoxy, or phenyl substituted with 1 to 3 substituents chosen from C ⁇ -C 4 alkyl, Ci-C ⁇ alkoxy, halogen and CF3.
• C ⁇ -C 6 alkyl identical or different and represent hydrogen, C ⁇ -C 6 alkyl, Ci-C ⁇ hydroxyalkyl, C 3 -C ⁇ cycloalkyl, C ⁇ -C 4 alkoxy, or phenyl substituted with 1 to 3 substituents chosen from C ⁇ -C alkyl, C ⁇ -C 6 alkoxy, halogen and CF3.
• JP Patent publication 2-11580 discloses the compound represented in the following formula (5),
• L is low alkyl, halogen, methoxy, methoxyphenoxy, benzyloxy, methylthio or methylvinyl; and n is an integer of 0 to 2.
• JP Patent publication sho 53-40767 and sho 54-112828 also disclose that phenoxypropionic acid amide derivatives have herbicidal activity.
• inventors of the present invention disclosed herbicidal phenoxypropionic acid N-alkyl-N-2-fluorophenyl amide compounds in International Pat. Publication No. WO 2000/05956.
• the inventors have intensively studied to provide herbicides to effectively control barnyard grass, and particularly, to find out selective herbicidal activity of phenoxypropionic acid N-alkyl-N-2-fluorophenyl amide compounds of formula (6).
• phenoxypropionic acid N-alkyl-N-2-fluorophenyl amides of formula (6) exist as (R)- or (S)-stereoisomer, and (R)-stereoisomers provide higher stability to rice and better herbicidal activity compared to (S)-stereoisomers or mixtures thereof. This superior activity of (R)-stereoisomers is distinguished from the conventional inventions.
• an object of the present invention is to provide optically active herbicide compounds which exhibit excellent selectivity toward rice and prevent the production of harmful barnyard grass.
• the present invention is to provide optically active herbicide phenoxypropionic acid N-methyl-N-2-fluorophenyl amides of formula (1) with an excellent herbicidal activity as well as selective and remarkable stability toward rice,
• X is hydrogen, halogen, hydroxy, NH 2 , CO2H, Ci-C ⁇ alkylamino substituted with 1 or 2 of Ci-C3 alkyl, Ci-C ⁇ alkyl, C ⁇ -C 6 alkoxy, C1-C3 haloalkyl, C1-C3 haloalkoxy, C 2 -Q alkoxyalkoxy, Ci-Q alkylthonyl, d-C 4 alkylsulfonyl, C 2 -C 6 alkenyl, C 2 -C 6 alkinyl, C 2 -C 6 alkenyloxy, C 2 -C 6 alkinyloxy, C1-C3 alkoxycarbonyl, or O-C3 alkylcarbonyl; Y is hydrogen or fluoro; and n is an integer of 0 to 2, wherein X can be a combination of other substituents when n is 2.
• optically active compounds of formula (1) according to the present invention may be specified as the following Table 1.
• optically active compounds of formula (1) according to this invention may be synthesized by employing a conventional method represented in the following Scheme 1, reacting a compound of formula (7) with a compound of formula (8),
• X' is OH, CI, Br, or phenoxy;
• X is hydrogen, halogen, hydroxy, NH 2 , C0 2 H, C ⁇ -C 6 alkylamino substituted with 1 or 2 of Ci-C 3 alkyl, Ci-C ⁇ alkyl, Ci- C ⁇ alkoxy, Q-C?
• haloalkyl C1-C3 haloalkoxy, C 2 -Q alkoxyalkoxy, C1-C4 alkylthonyl, Ci-Q alkylsulfonyl, C 2 -C 6 alkenyl, C2-C6 alkinyl, C 2 -C 6 alkenyloxy, C 2 -C 6 alkinyloxy, Ci-C 3 alkoxycarbonyl, or C1-C3 alkylcarbonyl; Y is hydrogen or fluoro; and n is an integer of 0 to 2, wherein X can be a combination of other substituents when n is 2.
• a binder such as triphenylphosphine and an organic base such as triethylamine or pyridine at a temperature of 0 to 100 ° C in an inert solvent such as ethers like tetrahydrofuran, ethyethyl acetate, acetonitrile, toluene, xylene, hexane, methylene chloride, carbon tetrachloride, dichloroethane or the like. After the solvent is evaporated, the crude product is purified by column chromatography.
• an inert solvent such as ethers like tetrahydrofuran, ethyethyl acetate, acetonitrile, toluene, xylene, hexane, methylene chloride, carbon tetrachloride, dichloroethane or the like.
• X is CI, Br, I, benzenesulfonyloxy, toluenesulfonyloxy, methanesulfonyloxy or low alkyl sulfate; and X is hydrogen, halogen, hydroxy, NH 2 , CO2H, Ci-C ⁇ alkylamino substituted with 1 or 2 of C1-C3 alkyl, Ci-C 6 alkyl, Ci-C ⁇ alkoxy, Ci-C 3 haloalkyl, C1-C3 haloalkoxy, C 2 -C 4 alkoxyalkoxy, Ci-C alkylthonyl, Ci-Q alkylsulfonyl, C 2 -C 6 alkenyl, C 2 -C 6 alkinyl, C 2 -C 6 alkenyloxy, C 2 -C ⁇ alkinyloxy, G-C3 alkoxycarbonyl, or O-C3 alkylcarbonyl;
• a strong base which is enough to pull out a hydrogen from amide, NH.
• a strong base include NaOH, KOH, LiOH, NaH, n-BuLi, LDA, and the like.
• the reaction is performed at a temperature of -78 to 50 ° C in an inert solvent such as ethers like ethylether, dioxane or tetrahydrofuran or hydrocarbons like hexane.
• Y' is halogen, alkylsulfonyloxy, haloalkylsulfonyloxy, benzenesulfonyloxy or toluenesulfonyloxy;
• X is hydrogen, halogen, hydroxy, NH 2 , CO2H, Ci-C ⁇ alkylamino substituted with 1 or 2 of C1-C3 alkyl, Ci-C ⁇ alkyl,
• Y is hydrogen or fluoro
• n is an integer of 0 to 2, wherein X can be a combination of other substituents when n is 2.
• examples of the base include inorganic bases of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkali metal carbonates such as sodium carbonate and potassium carbonate, alkali metal hydrogen carbonates such as sodium hydrogencarbonate and potassium hydrogencarbonate; and organic bases such as triethylamine, N,N- dimethylaniline, pyridine and l,8-diazabicyclo[5,4,0]undec-7-ene.
• phase transition catalyst such as tetra-n-butylammonium bromide or 18-crown-6-[l,4,7,10,13,16-hexaoctacyclooctadecane] may be added to rapidly complete the reaction, if necessary. Further, one or more than two solvents may be used, if deemed necessary.
• the inert organic solvent examples include ketones such as acetone; aromatic hydrocarbons such as toluene, xylene and chlorobenzene; aliphatic hydrocarbons such as petroleum ether and ligroin; ethers such as diethylether, tetrahydrofuran and dioxane; nitrites such as acetonitrile and propionitrile; and amides such as N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone.
• a reaction is carried out at a temperature of from 0 ° C to reflux, preferably at 5 to 50 ° C , for 1 to 24 hour(s) to afford the desired product with high yield.
• Y' is halogen, alkylsulfonyloxy, haloalkylsulfonyloxy, benzenesulfonyloxy or toluenesulfonyloxy;
• X is hydrogen, halogen, hydroxy, NH 2 , C0 2 H, Ci-C ⁇ alkylamino substituted with 1 or 2 of Ci-C 3 alkyl, Ci-C 6 alkyl, Ci-C ⁇ alkoxy, C1-C3 haloalkyl, Ci-C 3 haloalkoxy, C 2 -C alkoxyalkoxy, Ct-C alkylthonyl, C1-C4 alkylsulfonyl, C2-C0 alkenyl, C 2 -C 6 alkinyl, C 2 -C 6 alkenyloxy, C 2 -C ⁇ alkinyloxy, C1-C3 alkoxycarbonyl, or Q-C3 alkylcarbonyl;
• examples of the base include inorganic bases of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkali metal carbonates such as sodium carbonate and potassium carbonate, alkali metal hydrogencarbonates such as sodium hydrogencarbonate and potassium hydrogencarbonate; and organic bases such as triethylamine, N,N- dimethylaniline, pyridine, picoline, quinoline, and l,8-diazabicyclo[5,4,0]undec- 7-ene.
• alkali metal hydroxides such as sodium hydroxide and potassium hydroxide
• alkali metal carbonates such as sodium carbonate and potassium carbonate
• alkali metal hydrogencarbonates such as sodium hydrogencarbonate and potassium hydrogencarbonate
• organic bases such as triethylamine, N,N- dimethylaniline, pyridine, picoline, quinoline, and l,8-diazabicyclo[5,4,0]undec- 7-ene.
• phase transition catalyst such as tetra-n-butylammonium bromide or 18-crown-6[l,4,7,10,13,16-hexaoctacyclooctadecane] may be used, if necessary. Further, more than one solvent may be used if deemed necessary.
• the inert organic solvent examples include ketones such as acetone and butanone; aromatic hydrocarbons such as benzene, toluene, xylene and chlorobenzene; aliphatic hydrocarbons such as petroleum ether, and ligroin; ethers such as diethylether, tetrahydrofuran and dioxane; nitriles such as acetonitrile or propionitrile; and amides such as N,N-dimethylformamide, N,N-dimethyl acetamide and N-methylpyrrolidone.
• a reaction is carried at a temperature of from 0 ° C to reflux, preferably at 20 to 100 ° C for 1 to 24 hour(s) to afford the desired product with high yield.
• Example 1 Preparation of (S)-2-bromo-propionic acid-N-(2-fluorophenyl)-N- methyl amide
• Example 5 Preparation of (R)-2-[4-(6-chloro-2-benzoxazolyloxy)- phenoxyjpropionic acid-N-(2-fluorophenyl)-N-methyl Amide (R)-2-[4-(6-chloro-2-benzoxazoyloxy)-phenoxy]propionic acid-N-(2- fluorophenyl) amide (100 mg, 0.24 mmol) was dissolved in 10 ml of anhydrous tetrahydrofuran and 60% NaH(10 mg, 0.24 mmol) and CH 3 I(34 mg, 0.24 mmol) were added sequentially at 0 ° C . The reaction mixture was stirred at room temperature for 5 hours.
• the reaction mixture was cooled to room temperature and acidified with 5% hydrochloric acid.
• the acidified reaction mixture was extracted three times with ethyl acetate.
• the combined organic solvent layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure.
• the acidified reaction mixture was extracted three times with ethyl acetate.
• the combined organic solvent layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure.
• the compounds according to the present invention should be formulated in such a suitable type such as wettable powder, emulsions, granules, dusts, suspensions and solutions by combining a carrier, a surfactant, a dispersing agent or a supplement agent. Many of these may be applied directly or after diluted with suitable media.
• Formulations can be prepared at spray volume of from hundreds liters to thousands liters per hectare. The formulations contain about 0.1% to 99% by weight of active ingredient(s) and 0.1% to 20% surfactant(s) or 0% to 99.9% solid or liquid diluent(s) are recommended to be added. The formulations will contain these ingredients in the following approximate proportions shown in Table 3. Table 3
• the proportion of active ingredients depends on the intended use. Higher ratio of a surfactant is sometimes desired to active ingredients and is achieved by incorporation into the formulation or tank mixing.
• Solid diluents with high absorption are preferred for wettable powder.
• Liquid diluents and solvents are preferred to be stable against phase separation at 0 ° C . All the formulations may contain a small amount of additives to prevent forming, caking, corrosion and growth of microorganisms.
• solutions can be made only by blending ingredients and fine solids by blending and pulverizing with hammer-mill.
• Suspensions can be made by wet-milling and granules can be made by spraying the active ingredients on performed granular carrier.
• Formulation 1 Wettable Powder
• the ingredients are thoroughly blended, re-blended after spraying liquid surfactant on the solid ingredients and hammer-milled until all the solids are essentially under 100 ⁇ m.
• Active ingredient (Compound of Example 3) 20 wt. %
• Formulation 2 Wettable Powder
• the ingredients are blended, hammer-milled until all the solids are under 25 ⁇ m and packaged.
• Active ingredient (Compound of Example 3) 80 wt. % Sodium alkyl naphthalenesulf onate 2 wt.%
• the ingredients are mixed and homogeneously dissolved to give emulsions.
• Active ingredient (Compound of Example 3) 30 wt. % Cyclohexanone 20 wt. % Polyoxyethylene alkylaryl ether 11 wt.%
• the formulations according to this invention were sprayed with diluting to a certain concentration.
• the compounds according to the present invention represent high activity as leaf treatment herbicides for rice and especially effective in rice due to an excellent control of barnyard grass.
• the active ingredients can be used from 10 g to 4 kg per hectare, preferably from 50 g to 400 g.
• the amount of the compounds of the present invention depends on the amount and size of weeds and formulations.
• the herbicides of the present invention can be used as alone or in combination with other herbicides, insecticides or bactericides.
• one agent selected from the group consisting of bentazon, quinclorac, propanil, simetryn, 2,4-D, fenoxaprop-ethyl, linuron, MCPA, azafenidin, carfentrazone, molinate, thiobencarb, pendimethalin, bensulfuron-methyl, pyrazosulfuron- ethyl, metsulfuron-methyl, thifensulfuron-methyl, tribenuron-methyl, trifluralin, amidosulfuron, bromoxynil, butachlor, mecoprop, metribuzin, bifenox, benfuresate, isoproturon, cyhalofop-butyl, mefenaset, fentrazamide, pyriminobac-methyl, bispyribac sodium, azimsulfruon, cyclosulfamuron, pyanchor, and mixtures thereof
• the active compound(s) of formula (1) according to the invention exhibited an excellent selectivity toward the plants and herbicidal activity against weeds.
• optically active (R)-stereoisomers of the present invention exhibit excellent selectivity toward rice and superior herbicidal activity against barnyard grass to racemic mixtures and (S)- stereoisomers thereof. Therefore, the optically active compounds of the present invention may be very effective in rice farming. Further, it is proved that the optically active compounds are very stable for wheat, barley, beans, and corn and useful to control weeds.

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• Life Sciences & Earth Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
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• Pest Control & Pesticides (AREA)
• Agronomy & Crop Science (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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• 2001
  • 2001-11-01 CN CN01823753.3A patent/CN1279031C/zh not_active Ceased
  • 2001-11-01 AU AU2002212806A patent/AU2002212806B2/en not_active Expired
  • 2001-11-01 US US10/494,084 patent/US20050043180A1/en not_active Abandoned
  • 2001-11-01 EP EP01981146A patent/EP1448058A4/en not_active Withdrawn
  • 2001-11-01 HU HU0402057A patent/HU230485B1/hu not_active IP Right Cessation
  • 2001-11-01 BR BRPI0117166-6A patent/BRPI0117166B1/pt active IP Right Grant
  • 2001-11-01 CA CA002465342A patent/CA2465342C/en not_active Expired - Fee Related
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  • 2001-11-01 JP JP2003539442A patent/JP2005507402A/ja active Pending
• 2004
  • 2004-04-26 BG BG108697A patent/BG66413B1/bg unknown

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